Typical ACE DOUBLE book. It includes two novellas by SF authors. Pretty good way to get published in the 1950s.

The Cosmic Puppets by Philip K. Dick (1957)
This was a really interesting story. I was vary much a Ray Bradbury type of tale about god-like beings who are impacting a small town for decades. Good story.

Sargasso of Space by Andre Norton (Andrew North) (1955)
Typical 1950s adolescent SF space story. Not that good. ( )